speedyman_2 Posted March 22, 2007 Report Share Posted March 22, 2007 About two days ago the SES light came on. I checked the codes and found the P0300 code. Random Miss fire right? This can be caused by quite a few things. The only thing I've noticed is a rough idle when cold. The engine shakes the whole car and if put in gear the car will surge in pulses with the rough idle. I'm guessing this has something to do with the miss fire as well. Except the SES light doesn't come on until way after that. Sometimes not even until my drive home from work. Which is what happened today. Any suggestions on where I should start? Link to comment Share on other sites More sharing options...
chriscisme Posted March 22, 2007 Report Share Posted March 22, 2007 the same thing happedn to me a couple weeks after got my caddy, i turned out the previous owner was oblivious to tune-ups, got an oil change, new plugs and wires, and charged the battery...if you can afford it id also reccomend getting new coil packs. make surfe to only use ac delco plugs, and i recommend ac delco for the coil packs Link to comment Share on other sites More sharing options...
speedyman_2 Posted March 22, 2007 Author Report Share Posted March 22, 2007 the same thing happedn to me a couple weeks after got my caddy, i turned out the previous owner was oblivious to tune-ups, got an oil change, new plugs and wires, and charged the battery...if you can afford it id also reccomend getting new coil packs. make surfe to only use ac delco plugs, and i recommend ac delco for the coil packs Just replaced the plugs a few weeks ago. Wires looked great but who knows. Coil pack could be the problem. Haven't even touched it before. Anyway to get the car checked out to know exactly what it is. Link to comment Share on other sites More sharing options...
JimD Posted March 22, 2007 Report Share Posted March 22, 2007 After dark, pull the beauty cover and mist the plug wires. If you see any arcing, you are due for new wires. Use a short length of hose as a stethoscope and listen to each coil. If the coil insulation is breaking down internally, you might be able to hear it arcing. And triple check all the plug wires for tight connections at both ends. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
Ranger Posted March 22, 2007 Report Share Posted March 22, 2007 I second the wires. Can't go by looks. Stick with A/C Delco. Link to comment Share on other sites More sharing options...
speedyman_2 Posted March 22, 2007 Author Report Share Posted March 22, 2007 I second the wires. Can't go by looks. Stick with A/C Delco. Yep, gonna check them tonight. Definitely sticking with A/C Delco. OEM plugs are in as well. How much for a new set of plug wires? And what's the lifespan of them? I have the set I took of my old engine, but it had 97,000 miles when I took them off. Should I just trash them? Link to comment Share on other sites More sharing options...
Ranger Posted March 23, 2007 Report Share Posted March 23, 2007 At 97K they could be iffy. They may last 200K if not disturbed. Mine went on my '97 at about 78K, right after they were moved around for the fuel rail recall. You could try the old ones and see if it makes an improvement. As far as the price goes, are you sitting down? I think I paid about $120 or so from http://www.rockauto.com. Now if you want to feel better about that price, call the dealer and get a price quote. Link to comment Share on other sites More sharing options...
speedyman_2 Posted March 23, 2007 Author Report Share Posted March 23, 2007 At 97K they could be iffy. They may last 200K if not disturbed. Mine went on my '97 at about 78K, right after they were moved around for the fuel rail recall. You could try the old ones and see if it makes an improvement. As far as the price goes, are you sitting down? I think I paid about $120 or so from http://www.rockauto.com. Now if you want to feel better about that price, call the dealer and get a price quote. Yeah I may try them just to see. I just bought a new PCV Valve. Installed it. I'll see how it does in the morning. Tried the water mist test on the wires. no arching anywhere. I've yet to check out the coil pack though. Link to comment Share on other sites More sharing options...
speedyman_2 Posted March 23, 2007 Author Report Share Posted March 23, 2007 Woohoo. Drive to work was great. Drive home was great. No SES light. I guess the PCV Valve did it. I still plan on getting the coil pack checked out since she's not that young anymore. Link to comment Share on other sites More sharing options...
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